An asphalt paving device for road construction and a method of using the same

Abstract

The present application relates to the field of road construction, in particular to a kind of asphalt laying device for road construction and its use method, including mounting beam frame, spray head assembly, backflow component and switching control component, the mounting beam frame is symmetrically provided with several assembly base plates by screw horizontally, the upper end of assembly base plate is equipped with control valve, the side of mounting beam frame close to assembly base plate is all opened with connecting window, by installing assembly, one rotatable rotating ball seat can be detachably installed in the lower end of control valve, then two operating spray pipes are symmetrically provided in the two sides of rotating ball seat and are communicated, when asphalt oil spraying operation is carried out, it can be used as one standby, after spraying is finished, by switching control component adjustment, it is the attitude of washing backflow, when cleaning fluid passes through operating spray pipe, it is directly sprayed into backflow pipeline from telescopic spray pipe and is backflowed for use, avoid the loss and environmental pollution caused by direct external discharge, it is simple to operate and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of road construction, specifically to an asphalt paving device for road construction and its usage method. Background Technology

[0002] Asphalt can be mainly divided into three types: coal tar pitch, petroleum asphalt, and natural asphalt. It has good fluidity, thermal stability, long-lasting adhesion, elasticity, electrical insulation, and water resistance, and is widely used in road construction. The existing asphalt pavement construction requires road repair and cleaning, followed by spraying hot asphalt, rubber asphalt, modified asphalt, asphalt oil, or other liquid asphalt onto the road surface. After spraying the liquid asphalt, the asphalt pavement material is poured and compacted. After road maintenance, the construction is completed. There are two main types of liquid asphalt spraying equipment: small manual spraying equipment and large spraying vehicles. During spraying, high-pressure gas and electromagnetic control valves are used to spray the liquid asphalt oil onto the road surface. After spraying, in order to prevent the asphalt liquid from becoming viscous and solidifying, the asphalt oil delivery pipeline and nozzles need to be flushed and cleaned. However, the existing asphalt oil spraying equipment wastes a lot of flushing fluid and asphalt oil during flushing, which is costly and easily pollutes the environment. Summary of the Invention

[0003] The purpose of this invention is to provide an asphalt paving device for road construction and its method of use, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an asphalt paving device for road construction, the asphalt paving device for road construction comprising: The installation beam frame is horizontally and symmetrically equipped with several assembly base plates by screws. Each assembly base plate is equipped with a control valve at its upper end. Each side of the installation beam frame near the assembly base plate is equipped with a connection window. The control valve is equipped with a liquid delivery pipe through the assembly base plate and the connection window. The nozzle assembly is mounted on one side of the liquid delivery pipe via an installation component. The nozzle assembly includes a rotating ball seat and two telescopic nozzles. Two working nozzles are symmetrically arranged on both sides of the rotating ball seat. The two telescopic nozzles are respectively movably inserted into the two working nozzles. The installation component includes an installation branch pipe. The rotating ball seat is rotatably sleeved onto the installation branch pipe. A reflux assembly, comprising two reflux lines, which are respectively horizontally arranged on both sides of the rotating ball seat; The switching control assembly includes three control gear plates, with a toggle gear sleeved on one side of the rotating ball seat, and the three control gear plates are respectively meshed with the toggle gears of the three rotating ball seats.

[0005] Preferably, the two working nozzles are respectively connected to the rotating ball seat with telescopic cavity grooves, the two telescopic nozzles are respectively movably inserted into the two telescopic cavity grooves, one side of the two telescopic nozzles respectively movably passes through the two working nozzles, the side of the telescopic nozzle placed in the telescopic cavity groove is fitted with a first piston, and the side of the telescopic nozzle placed outside the working nozzle is fitted with an adjusting cap.

[0006] Preferably, the rotating ball seat has an inner cavity in its side wall, and the working nozzle has several piston grooves connected to the inner cavity. The telescopic nozzle is symmetrically provided with several pneumatic push rods on the side outside the working nozzle. The pneumatic push rods are movably inserted into the several piston grooves, and a second piston is provided on the side of the pneumatic push rods placed in the piston grooves.

[0007] Preferably, a bearing sleeve is provided on one side of the rotating ball seat, and the virtual axis of the bearing sleeve is arranged in a cross shape with the virtual axis of the working nozzle. The side of the rotating ball seat that is relatively far away from the bearing sleeve is provided with an air inlet connector, which is connected to the inner cavity.

[0008] Preferably, the liquid delivery pipe has an L-shaped structure at the lower end of the connecting window. The outer periphery of the horizontal section of the liquid delivery pipe is provided with external threads. A prismatic insert is connected to the side of the liquid delivery pipe with external threads. A prismatic groove is opened on the side of the mounting branch pipe. The prismatic insert of the liquid delivery pipe is inserted into the prismatic groove of the mounting branch pipe. The side of the mounting branch pipe away from the liquid delivery pipe is provided with a bearing sleeve through a sealing bearing. The side of the mounting branch pipe close to the liquid delivery pipe is provided with a mounting nut through a constraint ring. The mounting nut is threaded to the external threads of the liquid delivery pipe.

[0009] Preferably, both return lines have a connecting hole on the side near the working nozzle. When the two working nozzles are set horizontally and high-pressure gas is injected into their inner cavities, the adjusting caps on one side of the two telescopic nozzles are respectively inserted into the connecting holes of the two return lines.

[0010] Preferably, the upper end of the mounting branch pipe placed inside the rotating ball seat is provided with a sealing block. The upper end of the sealing block is sealed and fitted to the inner wall of the rotating ball seat. The cross-sectional area of ​​the sealing block is larger than the diameter of the telescopic cavity groove. The lower end of the assembly base plate is provided with a positioning seat directly above the rotating ball seat. The lower end of the positioning seat is provided with a positioning groove. When the two working nozzles are vertically set and high-pressure gas is injected into the inner cavity, the adjusting cap in one of the working nozzles is inserted into the positioning groove.

[0011] Preferably, the actuating gear is sleeved on the bearing sleeve of the rotating ball seat, and the mounting beam is horizontally provided with guide holes on both sides near the actuating gear. The control tooth plate moves horizontally through two guide holes on one side, and the three control tooth plates are horizontally provided with synchronous tie rods on the side outside the mounting beam.

[0012] Preferably, the synchronous tie rod has an internal threaded block at its center, and the mounting beam has an extension plate horizontally positioned on one side near the internal threaded block. The upper end of the extension plate has three symmetrical fixing holes. A fixing bolt is vertically inserted through the center of the internal threaded block, and the lower end of the fixing bolt is inserted into one of the fixing holes.

[0013] A method for using an asphalt paving device for road construction, wherein the method of using the asphalt paving device for road construction is applied to the aforementioned asphalt paving device for road construction, includes the following steps: Step 1: When flushing the pipelines, control valves, and telescopic nozzles of the asphalt spraying truck is required, loosen the fixing bolts and move the control tooth plate. When the control tooth plate moves, it will cause the rotating ball seat connected to the shift gear to rotate around the installation branch pipe, keeping the two working nozzles in a horizontal position. Insert the fixing bolt into another fixing hole to fix them. At this time, the high-pressure gas connected to the air inlet connector is sent into the inner cavity. The high-pressure gas pushes several second pistons and pneumatic push rods to move. The telescopic nozzle and one side of the adjusting cap are inserted into the docking hole of the return pipeline. At this time, when the control valve delivers flushing fluid, the flushing fluid enters the installation branch pipe from the delivery pipe, then enters the rotating ball seat from the installation branch pipe, and then flows into the two return pipelines from the two telescopic chambers and the telescopic nozzle for return. After cleaning, maintain this position and seal the end of the adjusting cap for protection, waiting for the next use.

[0014] Step 2: When using asphalt oil spraying, similarly control the working nozzle to be in a vertical position, send high-pressure gas into the inner cavity, insert the upper telescopic nozzle into the positioning groove for positioning and fixation, and seal the telescopic cavity groove of the telescopic nozzle position with the sealing block. The lower telescopic nozzle has a better sealing effect under the action of compression. Asphalt oil enters the rotating ball seat from the installation branch pipe and then sprays out from the lower telescopic nozzle.

[0015] Compared with the prior art, the beneficial effects of the present invention are: A rotatable ball seat can be detachably installed at the lower end of the control valve via an installation component. Two working nozzles are symmetrically connected to both sides of the ball seat. During asphalt oil spraying, one nozzle can be used and the other can be kept as a backup. After spraying is completed, the control component can be switched to a flushing and return mode. When the cleaning fluid passes through the working nozzle, it is directly sprayed into the return pipeline from the telescopic nozzle for reuse, avoiding losses and environmental pollution caused by direct external discharge. The operation is simple and convenient. Attached Figure Description

[0016] Figure 1 This is a first-view schematic diagram of the structure of the present invention; Figure 2 This is a second-view schematic diagram of the structure of the present invention; Figure 3 For the present invention Figure 2Schematic diagram of part A; Figure 4 This is a side-section schematic diagram of the rotating ball seat connection of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of part B; Figure 6 For the present invention Figure 5 Schematic diagram of part C; Figure 7 This is a side sectional view of the structure of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of part D; Figure 9 This is a cross-sectional view of the fixed bolt connection of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of part E; Figure 11 This is a schematic diagram of the interaction between the control tooth plate and the actuating gear of the present invention; Figure 12 This is a schematic diagram of the liquid delivery pipe connection structure of the present invention; Figure 13 This is a schematic diagram of the rotating ball seat connection structure of the present invention; Figure 14 This is a schematic diagram of the branch pipe installation structure of the present invention.

[0017] In the diagram: 1. Mounting beam; 2. Control valve; 3. Assembly base plate; 4. Liquid delivery pipe; 5. Prism-shaped insert pipe; 6. Mounting branch pipe; 7. Mounting nut; 8. Rotating ball seat; 9. Working nozzle; 10. Telescopic cavity groove; 11. Telescopic nozzle; 12. Adjusting cap; 13. First piston; 14. Inner cavity; 15. Piston groove; 16. Pneumatic push rod; 17. Second piston; 18. Air inlet connector; 19. Sealing block; 20. Return pipeline; 21. Connecting hole; 22. Actuating gear; 23. Control gear plate; 24. Synchronous tie rod; 25. Internal threaded block; 26. Fixing hole; 27. Fixing bolt; 28. Positioning seat; 29. ​​Positioning groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-14 The present invention provides the following technical solutions: Example 1 An asphalt paving device for road construction includes a mounting beam 1 with several mounting base plates 3 horizontally and symmetrically arranged by screws. Each mounting base plate 3 has a control valve 2 at its upper end. Each side of the mounting beam 1 near the mounting base plate 3 has a connection window. The control valve 2 is connected to both the mounting base plate 3 and the connection window by a liquid delivery pipe 4. The mounting beam 1 in the figure is a partial schematic diagram. The length of the mounting beam 1 can be customized according to the usage standards. Asphalt oil or cleaning fluid can be sprayed out through control valve 2, and it is easy to disassemble and maintain. The nozzle assembly is set on one side of the liquid delivery pipe 4 through the installation component. The nozzle assembly includes a rotating ball seat 8 and two telescopic nozzles 11. Two working nozzles 9 are symmetrically arranged on both sides of the rotating ball seat 8. The two telescopic nozzles 11 are respectively movably inserted into the two working nozzles 9. The installation component includes an installation branch pipe 6. The rotating ball seat 8 is rotatably sleeved with the installation branch pipe 6. The two working nozzles 9 are respectively connected to the telescopic cavity groove 10 opened on the rotating ball seat 8. The two telescopic nozzles 11 are respectively movably inserted into the two telescopic cavity grooves 10. The two telescopic nozzles 11 are respectively movably inserted through the two working nozzles 9 on one side. The side of the telescopic nozzle 11 placed in the telescopic cavity groove 10 is sleeved with a first piston 13, and the side of the telescopic nozzle 11 placed outside the working nozzles 9 is sleeved with an adjusting cap 12. The side of the telescopic nozzle 11 near the rotating ball seat 8 is provided with a conical guide port to facilitate the flow of asphalt liquid from the telescopic cavity groove 10 into the telescopic nozzle 11. The two telescopic nozzles 11 are pushed and controlled. The side wall of the rotating ball seat 8 is provided with an inner cavity 14. The working nozzle 9 is connected to the inner cavity 14 and has several piston grooves 15. Several pneumatic push rods 16 are symmetrically provided on the side of the telescopic nozzle 11 outside the working nozzle 9. The several pneumatic push rods 16 are respectively movably inserted into the several piston grooves 15, and a second piston 17 is provided on the side of the pneumatic push rod 16 placed in the piston groove 15. In this embodiment, when high-pressure gas is filled into the inner cavity 14, the high-pressure gas drives the telescopic nozzle 11 and the adjusting cap 12 to move. The arrangement of the two working nozzles 9 and the telescopic nozzle 11 allows the other telescopic nozzle 11 to spray asphalt oil in a timely manner when one of the telescopic nozzles 11 becomes blocked, thereby reducing downtime for maintenance during construction.

[0020] Example 2 Based on Example 1, and referring to Figure 3 and Figure 8The rotating ball seat 8 is quickly connected to the control valve 2 and the liquid delivery pipe 4. The liquid delivery pipe 4 passes through the lower end of the connecting window and has an L-shaped structure. The outer circumference of the horizontal section of the liquid delivery pipe 4 is provided with external threads. The side of the liquid delivery pipe 4 with external threads is connected to a prismatic insert 5. A prismatic groove is opened on the side of the mounting branch pipe 6. The prismatic insert 5 of the liquid delivery pipe 4 is inserted into the prismatic groove of the mounting branch pipe 6. The side of the mounting branch pipe 6 away from the liquid delivery pipe 4 is set through the bearing sleeve by a sealing bearing. The side of the mounting branch pipe 6 close to the liquid delivery pipe 4 is provided with a mounting nut 7 through a constraint ring. The mounting nut 7 is threaded to the external thread of the liquid delivery pipe 4. The connection structure is simple and reliable. The prismatic structure of the insertion can prevent the mounting branch pipe 6 from rotating. A bearing sleeve is provided on one side of the rotating ball seat 8. The virtual axis of the bearing sleeve is arranged in a cross shape with the virtual axis of the working nozzle 9. The side of the rotating ball seat 8 that is relatively far away from the bearing sleeve is provided with an air inlet connector 18. The air inlet connector 18 is connected to the inner cavity 14. The rotating ball seat 8 can rotate along the mounting branch pipe 6 to realize the switching of the usage position of the two telescopic nozzles 11 and the horizontal maintenance.

[0021] Example 3 Based on Example 2, and referring to Figure 3 and Figure 5 The return assembly collects and returns the cleaning fluid and asphalt oil mixture sprayed from the telescopic nozzle 11. The return assembly includes two return lines 20, which are horizontally positioned on both sides of the rotating ball seat 8. Each of the two return lines 20 has a connecting hole 21 on the side closest to the working nozzle 9. When the two working nozzles 9 are horizontally positioned and high-pressure gas is injected into the inner cavity 14, the adjusting caps 12 on one side of the two telescopic nozzles 11 are respectively inserted into the connecting holes 21 of the two return lines 20. When the cleaning fluid is sprayed, it can be collected and returned to avoid waste and environmental pollution. Furthermore, when not spraying, the telescopic nozzle 11 can always maintain a horizontal posture, and the adjusting caps 12 inserted into the connecting holes 21 can shield and protect the holes at the position of the adjusting caps 12.

[0022] Example 4 Based on Example 3, and referring to Figure 1 and Figure 9-11The switching control component can control the rotation of the rotating ball seat 8. The switching control component includes three control tooth plates 23. A toggle gear 22 is sleeved on one side of the rotating ball seat 8, and the three control tooth plates 23 are respectively meshed with the toggle gears 22 of the three rotating ball seats 8. The toggle gears 22 are sleeved on the bearing sleeves of the rotating ball seat 8. Guide holes are horizontally opened on both sides of the mounting beam frame 1 near the toggle gears 22. The control tooth plates 23 are horizontally movable through the two guide holes on one side, and a synchronous tie rod 24 is horizontally provided on the side of the three control tooth plates 23 outside the mounting beam frame 1. The three control tooth plates 23 are a group. After being connected by the synchronous tie rod 24, the three control tooth plates 23 can be synchronously controlled. While ensuring the pulling, the structural stability of the pulling is improved, and the flexible deformation of the metal is avoided, which may cause damage and poor control effect. The synchronous tie rod 24 has an internal thread block 25 at its center. The mounting beam 1 has an extension plate horizontally positioned on the side near the internal thread block 25. Three fixing holes 26 are symmetrically opened at the upper end of the extension plate. A fixing bolt 27 is vertically inserted through the center of the internal thread block 25 by a bolt, and the lower end of the fixing bolt 27 is inserted into the fixing hole 26 on one side to fix the position of the control tooth plate 23. The operation is simple and convenient.

[0023] Example 5 Based on Example 4, and referring to Figure 3 and Figure 5 When the working nozzle 9 is set vertically, its position is reinforced and fixed. The upper end of the mounting branch pipe 6 placed inside the rotating ball seat 8 is provided with a sealing block 19. The upper end of the sealing block 19 is sealed and fitted to the inner wall of the rotating ball seat 8. The cross-sectional area of ​​the sealing block 19 is larger than the diameter of the telescopic cavity groove 10. The lower end of the mounting base plate 3 is provided with a positioning seat 28 directly above the rotating ball seat 8. The lower end of the positioning seat 28 is provided with a positioning groove 29. When the two working nozzles 9 are set vertically and high-pressure gas is injected into the inner cavity 14, the adjusting cap 12 inside one of the working nozzles 9 is inserted into the positioning groove 29, and the sealing block 19 seals the telescopic cavity groove 10 of the working nozzle 9. The docking hole 21, the adjusting cap 12 and the positioning groove 29 are all conical structures. When the high-pressure gas is lost in the inner cavity 14, rotating the ball seat 8 will allow the adjusting cap 12 to quickly disengage from the docking hole 21 and the positioning groove 29.

[0024] A method for using an asphalt paving device for road construction includes the following steps: Step 1: When flushing the pipelines, control valve 2, and telescopic nozzle 11 of the asphalt spraying truck is required, loosen the fixing bolt 27 and move the control tooth plate 23. When the control tooth plate 23 moves, it will rotate the rotating ball seat 8 connected to the shift gear 22 around the mounting branch pipe 6, keeping the two working nozzles 9 in a horizontal position. The fixing bolt 27 is inserted into another fixing hole 26 for fixation. At this time, the high-pressure gas connected to the air inlet connector 18 is sent into the inner cavity 14. The high-pressure gas pushes several second pistons 17 and pneumatic push rods 16 to move. One side of the telescopic nozzle 11 and the adjusting cap 12 is inserted into the docking hole 21 of the return pipeline 20. At this time, when the control valve 2 delivers flushing fluid, the flushing fluid enters the mounting branch pipe 6 from the delivery pipe 4, then enters the rotating ball seat 8 from the mounting branch pipe 6, and then flows into the two return pipelines 20 from the two telescopic chamber grooves 10 and the telescopic nozzle 11 for return. After cleaning, this position can be maintained, and the end of the adjusting cap 12 is sealed for protection, waiting for the next use.

[0025] Step 2: When using asphalt oil spraying, similarly control the working nozzle 9 to be in a vertical position, send high-pressure gas into the inner cavity 14, insert the upper telescopic nozzle 11 into the positioning groove 29 for positioning and fixation, and seal the telescopic cavity groove 10 of the telescopic nozzle 11 position. Under the action of compression, the lower telescopic nozzle 11 has a better sealing effect. Asphalt oil enters the rotating ball seat 8 from the installation branch pipe 6 and then sprays out from the lower telescopic nozzle 11.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An asphalt paving device for road construction, characterized in that, The asphalt paving device for road construction includes: The installation beam frame (1) is provided with several assembly base plates (3) horizontally and symmetrically arranged by screws. Each assembly base plate (3) is provided with a control valve (2) at the upper end. Each side of the installation beam frame (1) near the assembly base plate (3) is provided with a connection window. Each control valve (2) is provided with a liquid delivery pipe (4) through the assembly base plate (3) and the connection window. The nozzle assembly is mounted on one side of the liquid delivery pipe (4) via an installation component. The nozzle assembly includes a rotating ball seat (8) and two telescopic nozzles (11). Two working nozzles (9) are symmetrically arranged on both sides of the rotating ball seat (8). The two telescopic nozzles (11) are respectively movably inserted into the two working nozzles (9). The installation component includes an installation branch pipe (6). The rotating ball seat (8) is rotatably sleeved onto the installation branch pipe (6). The reflux assembly includes two reflux lines (20), which are horizontally arranged on both sides of the rotating ball seat (8); The switching control component includes three control gear plates (23), and a toggle gear (22) is sleeved on one side of the rotating ball seat (8). The three control gear plates (23) are respectively meshed with the toggle gears (22) of the three rotating ball seats (8). The two working nozzles (9) are respectively connected to the rotating ball seat (8) and have telescopic cavity slots (10). The two telescopic nozzles (11) are respectively movably inserted into the two telescopic cavity slots (10). The two telescopic nozzles (11) are respectively movably inserted through the two working nozzles (9) on one side. The telescopic nozzle (11) is fitted with a first piston (13) on one side inside the telescopic cavity slot (10), and the telescopic nozzle (11) is fitted with an adjusting cap (12) on the side outside the working nozzle (9). The rotating ball seat (8) has an inner cavity (14) in its side wall. The working nozzle (9) is connected to the inner cavity (14) and has several piston grooves (15). The telescopic nozzle (11) is placed outside the working nozzle (9) and has several pneumatic push rods (16) symmetrically arranged on one side. The pneumatic push rods (16) are movably inserted into the several piston grooves (15), and each pneumatic push rod (16) is placed in the piston groove (15) and has a second piston (17) on one side. The rotating ball seat (8) is provided with a bearing sleeve on one side. The virtual axis of the bearing sleeve and the virtual axis of the working nozzle (9) are arranged in a cross shape. An air inlet connector (18) is opened on the side of the rotating ball seat (8) that is relatively far away from the bearing sleeve. The air inlet connector (18) is connected to the inner cavity (14). Both return lines (20) have a connecting hole (21) on the side near the working nozzle (9). When the two working nozzles (9) are set horizontally and high-pressure gas is injected into the inner cavity (14), the adjusting caps (12) on the side of the two telescopic nozzles (11) are respectively inserted into the connecting holes (21) of the two return lines (20).

2. The asphalt paving device for road construction according to claim 1, characterized in that: The liquid delivery pipe (4) has an L-shaped structure at the lower end of the connecting window. The outer periphery of the horizontal section of the liquid delivery pipe (4) is provided with external threads. The side of the liquid delivery pipe (4) with external threads is connected to a prismatic insert (5). A prismatic groove is opened on the side of the mounting branch pipe (6). The prismatic insert (5) of the liquid delivery pipe (4) is inserted into the prismatic groove of the mounting branch pipe (6). The side of the mounting branch pipe (6) away from the liquid delivery pipe (4) is provided with a bearing sleeve through a sealing bearing. The side of the mounting branch pipe (6) close to the liquid delivery pipe (4) is provided with a mounting nut (7) through a constraint ring. The mounting nut (7) is threaded to the external thread of the liquid delivery pipe (4).

3. The asphalt paving device for road construction according to claim 2, characterized in that: The upper end of the installation branch pipe (6) placed inside the rotating ball seat (8) is provided with a sealing block (19). The upper end of the sealing block (19) is sealed and fitted to the inner wall of the rotating ball seat (8). The cross-sectional area of ​​the sealing block (19) is larger than the diameter of the telescopic cavity groove (10). The lower end of the assembly base plate (3) is provided with a positioning seat (28) directly above the rotating ball seat (8). The lower end of the positioning seat (28) is provided with a positioning groove (29). When the two working nozzles (9) are vertically set and high-pressure gas is injected into the inner cavity (14), the adjusting cap (12) in one of the working nozzles (9) is inserted into the positioning groove (29).

4. The asphalt paving device for road construction according to claim 3, characterized in that: The actuating gear (22) is sleeved on the bearing sleeve of the rotating ball seat (8). The mounting beam (1) has guide holes horizontally through both sides near the actuating gear (22). The control tooth plate (23) moves horizontally through the two guide holes on one side. The three control tooth plates (23) are positioned on the side outside the mounting beam (1) and have synchronous tie rods (24) horizontally installed.

5. The asphalt paving device for road construction according to claim 4, characterized in that: The synchronous tie rod (24) has an internal thread block (25) at its center. The mounting beam (1) has an extension plate horizontally positioned on one side near the internal thread block (25). Three fixing holes (26) are symmetrically opened at the upper end of the extension plate. A fixing bolt (27) is vertically inserted through the center of the internal thread block (25) by a bolt, and the lower end of the fixing bolt (27) is inserted into the fixing hole (26) on one side.

6. A method of using an asphalt paving device for road construction, characterized in that: The method of using the asphalt paving device for road construction, applied to the asphalt paving device for road construction as described in any one of claims 1-5, includes the following steps: Step 1: When it is necessary to flush the pipelines, control valve (2) and telescopic nozzle (11) of the asphalt spraying truck, loosen the fixing bolt (27) and control the control tooth plate (23) to move. When the control tooth plate (23) moves, it will drive the rotating ball seat (8) connected to the shifting gear (22) to rotate around the installation branch pipe (6), keeping the two working nozzles (9) in a horizontal position. The fixing bolt (27) is inserted into another fixing hole (26) for fixation. At this time, the high-pressure gas connected to the air inlet connector (18) is sent into the inner cavity (14), and the high-pressure gas pushes several second active nozzles. When the plug (17) and pneumatic push rod (16) move, the telescopic nozzle (11) and adjusting cap (12) are inserted into the docking hole (21) of the return line (20). At this time, when the control valve (2) delivers flushing fluid, the flushing fluid enters the installation branch pipe (6) from the delivery pipe (4), then enters the rotating ball seat (8) from the installation branch pipe (6), and then flows into the two return lines (20) from the two telescopic chambers (10) and the telescopic nozzle (11) for return. After cleaning, maintain this posture and seal the end of the adjusting cap (12) for protection, waiting for the next use. Step 2: When using asphalt oil spraying, similarly control the working nozzle (9) to be in a vertical position, send high-pressure gas into the inner cavity (14), insert the upper telescopic nozzle (11) into the positioning groove (29) for positioning and fixing, and seal the telescopic cavity groove (10) of the telescopic nozzle (11) for sealing. Under the action of compression, the lower telescopic nozzle (11) has a better sealing effect. Asphalt oil enters the rotating ball seat (8) from the installation branch pipe (6) and then sprays out from the lower telescopic nozzle (11).

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